import sys
import math
(x1, y1, x2, y2) = [float(i) for i in sys.stdin.readline().split()]
d = math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2)
print(d) import sys sys import math math float(i) for i in sys.stdin.readline().split() for i in sys.stdin.readline().split() i sys.stdin.readline().split() sys.stdin.readline().split sys.stdin.readline() sys.stdin.readline sys.stdin sys stdin readline split for i in sys.stdin.readline().split() float(i) float i (x1, y1, x2, y2) = [float(i) for i in sys.stdin.readline().split()] (x1, y1, x2, y2) x1 y1 x2 y2 [float(i) for i in sys.stdin.readline().split()] d = math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2) d math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2) math.sqrt math sqrt (x1 - x2) ** 2 + (y1 - y2) ** 2 (x1 - x2) ** 2 x1 - x2 x1 x2 2 (y1 - y2) ** 2 y1 - y2 y1 y2 2 print(d) print d d = math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2) math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2) d
import sys
import math
(x1, y1, x2, y2) = [float(i) for i in sys.stdin.readline().split()]
d = math.sqrt((x1 - x2) ** 2 + (y1 - y2) ** 2)
print(d)